喷管中气固两相流动的无颗粒区  

Particle-Free Zone of the Gas-Particle Two-Phase Flow in a Nozzle

作　　者：李星 张海滨[1] 白博峰 LI Xing;ZHANG Haibin;BAI Bofeng(State Key Laboratory of Multiphase Flow in Power Engineering,School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi'an 710049,China)

机构地区：[1]动力工程多相流国家重点实验室,西安交通大学化学工程与技术学院,西安710049

出　　处：《工程热物理学报》2022年第6期1535-1540,共6页Journal of Engineering Thermophysics

基　　金：中国博士后科学基金第68批面上资助(No.2020M683473)。

摘　　要：缩放喷管中的气固两相流在多种工业过程中存在,如固体火箭发动机喷管等。然而,目前“无颗粒区”的存在条件还未得到统一的认识,“无颗粒区”对气固相互作用、推力等参数的影响还未明晰。本文建立了欧拉–拉格朗日两相流模拟方法,研究了JPL 45°~15°喷管中气固两相流动特性,考查了颗粒尺寸对喷管扩张段“无颗粒区”大小、推力、比冲、两相流损失、喷管效率等参数的影响。结果发现,对于1μm的颗粒,喷管扩张段不存在“无颗粒区”。得出了喷管总推力随颗粒尺寸变化的非单调性,中等尺度颗粒造成的推力损失最大,而先前研究并未发现。发现了喷管的两相损失随颗粒尺寸基本呈对数增大的趋势,比冲和喷管效率随颗粒尺寸基本呈对数减小的趋势。The gas-particle two-phase flow is encountered in various industrial applications,such as the solid-propellant rocket motors.However,the condition for the emergence of the particle-free zone is still ambiguous,and the influence of the particle-free zone on the two-phase interaction and thrust is still unclear.In this work,we built an Eulerian-Lagrangian method for the simulation of the gas-particle flow in a JPL 45°~15°nozzle.Various parameters,such as the range of the particle-free zone,the thrust,the specific impulse,the two-phase loss and the nozzle efficiency,were examined.We found that the particle-free zone does exist only for 1μm particles.Moreover,the thrust does not change monotonously with particle size,which has not been noticed before.On the contrary,the two-phase loss,the specific impulse and the nozzle efficiency change logarithmically with particle size.

关 键 词：缩放喷管 气固两相流 无颗粒区 喷管性能 

分 类 号：O359[理学—流体力学]